Question: Name the most-produced rolling stock class operated by the New York City Subway ?
Paraphrase: Give me the name of the most-produced rolling stock class operated by the New York City Subway.
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q811704 . ?ent wdt:P1092 ?obj . ?ent wdt:P137 wd:Q7733 } ORDER BY DESC(?obj)LIMIT 5 
Answer: R142, R62A, R46, R188, R22